The Tubewalker app, also free, offers maps of routes between Underground stations on all major lines.

Meanwhile, demand for Boris Bikes is expected to begin earlier than normal during the rush-hour. The Cycle Hire App finds your nearest docking station and tells you how many bikes are available.

Traffic experts warn there will be heavy congestion if you decide to take the car into town. The UK Traffic Pro app, which costs £3.99, alerts you to congestion hotspots. It boasts travel news, a route planner and live pictures of main roads.

Once you arrive at the office, the free AppyParking app shows every controlled parking zone in London, along with paid meter bays and off-street parking.

Hailo, for taxis, and Kabbee, for minicabs, will help you track down a ride.

Uber, an app-based private hire service, is offering 50 per cent off all rides throughout the strike if you split your fare with another passenger.